What an impressive collection, Helen! Mine doesn't take up nearly that much space, as I buy only one copy of each book I own!
I added about a dozen to my shelf, since I spent lots of money in bookstores when I visited London last week. Here's my list of new acquistions:
Bilbo's Last Song - JRRT, illustrated by Pauline Baynes (lovely!)
a book of 20 LotR postcards, with pictures by various artists
The Soddit (Hobbit parody) - A.R.R.R. Roberts (funny)
The Hobbit Companion - David Day (I'm not a big Day fan, but this is a cute, illustrated little volume)
Tolkien: Man and Myth - Joseph Pearce (I've started reading this and am really enjoying it)
Tolkien and the Great War - John Garth
The Real Middle Earth - Brian Bates (Magic and Mystery in the Dark Ages)
Tolkien: A Cultural Phenomenon - Brian Rosebury
Tolkien's Art - Jane Chance
The People's Guide to J.R.R. Tolkien - essays from TORn authors
*
Now, where can I buy time to get all of those read?!
*...and the other two, if you counted? Well, they're not Tolkien-related, exactly (just two Harry Potter parodies...)